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Exchange equilibria of potassium in soils. III. Effect of K‐fertilization on K‐Ca exchange
Author(s) -
Poonia S. R.,
Niederbudde E. A.
Publication year - 1986
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19861490606
Subject(s) - potassium , soil water , saturation (graph theory) , cation exchange capacity , chemistry , human fertilization , analytical chemistry (journal) , mineralogy , clay minerals , mathematics , soil science , agronomy , environmental chemistry , geology , organic chemistry , combinatorics , biology
Exchange behaviour of potassium versus calcium in relation to K‐fertilization of four soils from Bavaria, viz. Aquic Hapludalf (Kreutenbach), Aquic Chromudert (Groeben), Typic Hapludalf (Geldersheim) and Typic Humaquept (Anglberg), having a wide range after K fertilization in their cation exchange capacity and clay mineralogy was investigated. Experimental results were analysed using Q/I, thermodynamic and empirical approaches. Application of K decreased the potential buffering capacity (PBC o K ) and increased AR o K in all the four soils; Q/I curves followed a second degree polynomial regression. The negative value of standard free energy of K‐Ca exchange (ΔGo) decreased with the application of K in all soils. The values of Gapon (K G ) and Vanselow (K V ) selectivity quotients, particularly at low K‐saturation, became small with the application of K. K V was more strongly K‐saturation dependent than K G . The experimental results have been discussed in the light of quantity and type of glycerol‐18 Å‐minerals.